All mainstream motherboards are dual-channel only(Quad-channel is HEDT only).So going 2x8 or 4x4 doesn't make a difference(ok maybe 1-2 fps but thats margin of error).You can see it on the processor spec list it says 2 channels.I think 2 dimm slots are "multiplexed" on motherboard hence 4 slots = 2 channel,8 slots = 4 channel.